Heating apparatus and method for cooking

ABSTRACT

A heating apparatus for cooking, which ventilates the insides of cooking chambers after the cooking of food in the cooking chambers is completed, to rapidly cook the insides of the cooking chambers, and selectively ventilates one out of the cooking chambers. The heating apparatus for cooking includes a main body including a plurality of cooking chambers, which are separable from each other; a plurality of heaters for respectively heating the cooking chambers; and a ventilating device for ventilating the cooking chambers by introducing external air, wherein the ventilating device includes an air blowing unit for blowing the external air to the insides of the cooking chambers, and a flow change unit for selectively supplying air blown by the air blowing unit to the cooking chambers. In addition, methods to achieve the above are disclosed.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Korean Patent Application Nos. 2004-113104 and 2004-113105, filed Dec. 27, 2004, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

Apparatuses and methods consistent with the present invention relate to a heating apparatus and method for cooking, and more particularly, to a heating apparatus having a ventilating device for selectively supplying air to a plurality of cooking chambers.

2. Description of the Related Art

As disclosed in Japanese Patent Laid-open Publication Nos. Heisei 8-247473 and 2002-71139, a conventional heating apparatus for cooking comprises a cooking chamber provided with a door, which is opened and closed, installed at the front surface thereof, a heater chamber installed in the rear portion of the inside of the cooking chamber for heating the cooking chamber, a centrifugal circulation fan installed in the heater chamber for circulating air in the cooking chamber, and a heater for heating the air blown by the circulation fan.

When the circulation fan in the heater chamber is operated by driving a motor, the air in the cooking chamber is circulated to the inside of the heater chamber so that the air is heated by the heater and is then re-supplied to the inside of the cooking chamber. Accordingly, food placed in the cooking chamber is heated and cooked by hot air.

Since the inside of the cooking chamber of the above heating apparatus for cooking is maintained at a high temperature by residual hot air remaining for a designated time even after the cooking of the food is completed, when a user carelessly takes the food from the cooking chamber, the user may be burned by the hot air in the cooking chamber.

SUMMARY OF THE INVENTION

Therefore, one aspect of the invention is to provide a heating apparatus for cooking, which ventilates the insides of cooking chambers after the cooking of food in the cooking chambers is completed, thereby rapidly cooling the insides of the cooking chambers.

Another aspect of the invention is to provide a heating apparatus for cooking, which selectively ventilates one out of a plurality of cooking chambers, thereby cooling the selected cooking chamber.

In accordance with one aspect, the present invention provides a heating apparatus for cooking comprising: a main body including a plurality of cooking chambers, which are separable from each other; a plurality of heaters for respectively heating the plurality of cooking chambers; and a ventilating device for ventilating at least one of the plurality of cooking chambers by introducing external air, wherein the ventilating device includes an air blowing unit for blowing the external air to the insides of the at least one of the plurality of cooking chambers, and a flow change unit for selectively supplying air blown by the air blowing unit to the at least one of the plurality of cooking chambers.

The plurality of cooking chambers include a first cooking chamber and a second cooking chamber, and the heaters include a first heater for heating the first cooking chamber and a second heater for heating the second cooking chamber.

The flow change unit includes: a housing having an inlet connected to an outlet of the air blowing unit, and first and second outlets respectively connected to the first and second cooking chambers; an adjusting member rotatably installed in the housing for selectively opening one of the first and second outlets; and a flow control motor for rotating the adjusting member.

The housing and the adjusting member have a cylindrical structure; and the adjusting member includes an inlet having a width larger than the rotating range of the adjusting member, and a third outlet having a width corresponding to the width of the first or second outlet of the housing.

The flow change unit further includes a sensing unit for sensing the position of the third outlet of the adjusting member.

The sensing unit includes: a plurality of sensing switches for respectively sensing whether or not the third outlet of the adjusting member coincides with the first outlet of the housing, coincides with the second outlet of the housing, or is located between the first and second outlets of the housing; and a sensing cam connected to a shaft of the flow control motor so that the sensing cam can selectively contact one of the plurality of sensing switches.

The ventilating device includes: a first air supply guide member connecting the air blowing unit and the inlet of the housing; a second air supply guide member connecting the first outlet of the housing and the first cooking chamber; a third air supply guide member connecting the second outlet of the housing and the second cooking chamber; and first and second air exhaust guide members for respectively exhausting air from the first and second cooking chambers.

The first and second cooking chambers are separated from each other by installing a detachable partition, or communicate with each other by eliminating the partition.

In accordance with another aspect, the present invention provides a heating apparatus for cooking comprising: a main body including a cooking chamber; a heater for heating the inside of the cooking chamber; a ventilating device for ventilating the cooking chamber; and a control unit for controlling the ventilating device so that the ventilating device is operated when cooking of food is completed.

The ventilating device includes: an air blowing unit for blowing external air to the inside of the cooking chamber; an air supply guide member for guiding the air blown by the air blowing unit; and an air exhaust guide member for guiding the exhaust of the air from the cooking chamber to the outside.

In accordance with yet another aspect, the present invention provides a heating apparatus for cooking comprising: a main body including a plurality of cooking chambers, which are separable from each other; a plurality of heaters for respectively heating the plurality of cooking chambers; and a ventilating device for ventilating at least one of the plurality of cooking chambers by introducing external air, wherein the ventilating device includes an air blowing unit for blowing the external air to the insides of the at least one of the plurality of cooking chambers, and a flow change unit formed integrally with the air blowing unit for selectively supplying air blown by the air blowing unit to the at least one of the plurality of cooking chambers.

The air blowing unit includes: a housing including an inlet formed through the central portion thereof, and a plurality of outlets formed through separated positions of the circumference thereof; an air blowing fan installed in the housing; and an air blowing motor installed outside the housing for rotating the air blowing fan.

The flow change unit includes: a cylindrical adjusting member rotatably installed in the housing, and including an outlet selectively communicating with one of the plural outlets of the housing; and a flow control motor for rotating the adjusting member.

The heating apparatus for cooking further comprises a connection shaft extended from the rotary center of the adjusting member to the outside of the housing, and provided with a through hole formed through the central portion thereof for passing a shaft of the air blowing motor; and a plurality of gears installed outside the housing for transmitting the rotation of the flow control motor to the connection shaft.

Other aspects of the invention include methods for achieving the above.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

FIG. 1 is a perspective view of a heating apparatus for cooking in accordance with a first embodiment of the present invention;

FIG. 2 is a sectional view of the heating apparatus for cooking in accordance with the first embodiment of the present invention;

FIG. 3 is a perspective view of a ventilating device of the heating apparatus for cooking in accordance with the first embodiment of the present invention;

FIG. 4 is an exploded perspective view of a flow change device of the heating apparatus for cooking in accordance with the first embodiment of the present invention;

FIG. 5 is a sectional view of the flow change device of the heating apparatus for cooking in accordance with the first embodiment of the present invention in a state in which a first outlet of the flow change device communicates with a first cooking chamber;

FIG. 6 is a sectional view of the flow change device of the heating apparatus for cooking in accordance with the first embodiment of the present invention in a state in which a second outlet of the flow change device communicates with a second cooking chamber;

FIG. 7 is a sectional view of the flow change device of the heating apparatus for cooking in accordance with the first embodiment of the present invention in a state in which the first and second outlets of the flow change device are closed;

FIG. 8 is a sectional view of a heating apparatus for cooking in accordance with a second embodiment of the present invention;

FIG. 9 is a perspective view of a ventilating device of the heating apparatus for cooking in accordance with the second embodiment of the present invention;

FIG. 10 is an exploded perspective view illustrating an air blowing device and a flow change device of the heating apparatus for cooking in accordance with the second embodiment of the present invention;

FIG. 11 is a sectional view illustrating the air blowing device and the flow change device of the heating apparatus for cooking in accordance with the second embodiment of the present invention;

FIG. 12 is a sectional view taken along the line A-A′ of FIG. 11 illustrating a state in which an outlet of an adjusting member is communicated with a first cooking chamber; and

FIG. 13 is a sectional view taken along the line A-A′ of FIG. 11 illustrating a state in which the outlet of the adjusting member is communicated with a second cooking chamber.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

Reference will now be made in detail to the embodiments of the present invention, an example of which is illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below to explain the present invention by referring to the annexed drawings.

FIGS. 1 to 7 illustrate a heating apparatus for cooking in accordance with a first embodiment of the present invention. As shown in FIGS. 1 and 2, the heating apparatus for cooking of this embodiment comprises a main body 10 provided with a cooking chamber 11 installed therein. The main body 10 includes an external case 12 made of an iron plate, and an internal case 13 installed in the external case 12 for defining the cooking chamber 11 under the condition that the internal case 13 is separated from the external case 12. The front surface of the cooking chamber 11 is opened so that food to be cooked is inserted into or taken out of the cooking chamber 11.

A door 14 vertically rotated for opening and closing the cooking chamber 11 is installed at the front surface of the main body 10, and an operating panel 15 including a display unit 15 a for displaying the operating state of the heating apparatus, operating buttons 15 b, and operating switches 15 c is installed on the front surface of the main body 10 above the door 14.

The cooking chamber 11 is divided into a first cooking chamber 11 a located at the upper portion thereof and a second cooking chamber 11 b located at the lower portion thereof by a detachable partition 16. That is, the cooking chamber 11 is divided into the first cooking chamber 11 a and the second cooking chamber 11 b by installing the partition 16 therein, and the first cooking chamber 11 a and the second cooking chamber 11 b are combined into the cooking chamber 11 by eliminating the partition 16. Food racks 17 a and 17 b for placing food thereon are respectively installed in the first and second cooking chambers 11 a and 11 b, and a plurality of support rails 18 a, 18 b, and 18 c for detachably supporting the partition 16 and the food racks 17 a and 17 b are formed on both side surfaces of the cooking chamber 11. After the partition 16 is separated from the cooking chamber 1, another food rack having the same shape as those of the food racks 17 a and 17 b of the first and second cooking chambers 11 a and 11 b may be installed at the position of the partition 16.

As shown in FIG. 2, a heater case portion 21 for forming a heater chamber 20 is recessed in the rear surface of the internal case 13 by a designated depth. A first circulation fan 22 a for circulating air in the first cooking chamber 11 a is installed in the upper portion of the inside of the heater chamber 20, and a first heater 23 a is installed at the outside of the first circulation fan 22 a. A second circulation fan 22 b for circulating air in the second cooking chamber 11 b is installed in the lower portion of the inside of the heater chamber 20, and a second heater 23 b is installed at the outside of the second circulation fan 22 b. The upper and lower portions of the heater chamber 20 are divided by a partition member 28, and first and second motors 24 a and 24 b for respectively driving the first and second circulation fans 22 a and 22 b are installed on the rear surface of the heater case portion 21. A cover 25 for covering the heater chamber 20 is installed at the front surface of the heater chamber 20, and inlets 26 a and 26 b and outlets 27 a and 27 b communicating with the first and second cooking chambers 11 a and 11 b are formed through the cover 25 so that air can be circulated through the inlets 26 a and 26 b and the outlets 27 a and 27 b.

The above configuration causes the air in the first and second cooking chambers 11 a and 11 b to be respectively heated by the first and second heaters 23 a and 23 b when the air in the first and second cooking chambers 11 a and 116 is circulated by the operation of the first and second circulation fans 22 a and 22 b. The first circulation fan 22 a and the first heater 23 a, or the second circulation fan 22 b and the second heater 23 b are selectively operated as occasion demands, thereby allowing one or all of the first and second cooking chambers 11 a and 11 b to be operated to cook food therein.

As shown in FIGS. 2 and 3, the heating apparatus for cooking of this embodiment further comprises a ventilating device 30 for selectively ventilating one of the first and second cooking chambers 11 a and 11 b. The ventilating device 30 includes an air blowing unit 31 installed between the internal case 13 and the external case 12 above the first cooking chamber 11 a for blowing external air to the insides of the first and second cooking chambers 11 a and 11 b, a flow change unit 40 installed on the first cooking chamber 11 a for selectively distributing the air blown by the air blown unit 31 to the first and second cooking chambers 11 a and 11 b, air supply guide members 32 a, 32 b, 32 c and 33 for guiding the air to the first and second cooking chambers 1 a and 11 b, and air exhaust guide members 34 a and 34 b for guiding the air from the first and second cooking chambers 11 a and 11 b to the outside.

As shown in FIGS. 4 and 5, the flow change unit 40 includes an inlet 41 a connected to an outlet 31 b of the air blowing unit 31, and first and second outlets 41 b and 41 c respectively connected to the first and second cooking chambers 11 a and 11 b. As shown in FIG. 3, the air supply guide members 32 a, 32 b, 32 c and 33 include a first air supply guide member 32 a having a pipe structure and connecting the outlet 31 b of the air blowing unit 31 and the inlet 41 a of the flow change unit 40, a second air supply guide member 32 b connecting the first outlet 41 b of the flow change unit 40 and the rear part of the first cooking chamber 11 a, a third air supply guide member 32 c connecting the second outlet 41 c of the flow change unit 40 and the rear part of the second cooking chamber 11 b, and a suction duct 33 for guiding the external air to an inlet 31 a of the air blowing unit 31. The air exhaust guide members 34 a and 34 b include a first air exhaust guide member 34 a for exhausting air from the first cooking chamber 11 a, and a second air exhaust guide member 34 b for exhausting air from the second cooking chamber 11 b.

The air blown by the operation of the air blowing unit 31 is selectively supplied to one of the first and second cooking chambers 11 a and 11 b by the operation of the flow change unit 40, thereby rapidly cooling the corresponding one of the first and second cooking chambers 11 a and 11 b. Further, the air in the first and second cooking chamber 11 a and 11 b is exhausted to the outside through the air exhaust guide members 34 a and 33 b in proportion to the amount of the air supplied to the first and second cooking chamber 11 a and 11 b.

As shown in FIGS. 4 and 5, the flow change unit 40 includes a cylindrical housing 41, the upper surface of which is opened, a cover 42 for covering the opened upper surface of the housing 41, a cylindrical adjusting member 43 rotatably installed in the housing 41 for adjusting the air blowing direction, a flow control motor 44 for rotating the adjusting member 43 in regular and reverse directions, and a sensing unit 50 for sensing the rotation of the adjusting member 43.

The housing 41 includes an inlet 41 a formed at one side thereof and connected to the air blowing unit 31, and first and second outlets 41 b and 41 c formed at the other side thereof. The first and second outlet 41 b and 41 c are separated from each other by a designated interval. Here, the first air supply guide member 32 a extended from the air blowing unit 31 is connected to the inlet 41 a of the housing 41, the second air supply guide member 32 b connected to the first cooking chamber 11 a is connected to the first outlet 41 b of the housing 41, and the third air supply guide member 32 c connected to the second cooking chamber 11 b is connected to the second outlet 41 c of the housing 41.

The adjusting member 43 in the housing 41 includes an inlet 43 a, having a width larger than the rotating range of the adjusting member 43, formed through the cylindrical side surface thereof so that the inside of the adjusting member 43 is communicated with the inlet 41 a of the housing 41, and an outlet 43 b, having a size corresponding to the width of the outlets 41 b and 41 c of the housing 41, formed through the cylindrical side surface thereof at a position corresponding to the positions of the first and second outlets 41 b and 41 c of the housing 41. The adjusting member 43 further includes a rotary shaft 43 c extended inwardly and outwardly from the central portion of the closed upper surface thereof so that the adjusting member 43 is rotatably connected to the housing 41. The rotary shaft 43 c of the adjusting member 43 is extended outwardly so that the rotary shaft 43 c passes through the central portion of the cover 42, and is connected to a shaft 44 a of the flow control motor 44.

The sensing unit 50 senses the rotation of the adjusting member 43, thus sensing the position of the outlet 43 b of the adjusting member 43. The sensing unit 50 includes first, second, and third sensing switches 51, 52, and 53 installed on the outer surface of the cover 42 along the rotating direction of the adjusting member 43, and a sensing cam 54 installed on the shaft 44 a of the flow control motor 44 so that the sensing cam 54 can selectively contact the sensing switches 51, 52, and 53. Reference numeral 45 represents a motor support plate for supporting the flow control motor 44.

The adjusting member 43 in the housing 41 of the flow change unit 40 is rotated in a regular or reverse direction by the operation of the flow control motor 44 so that the outlet 43 b of the adjusting member 43 is located at a position coinciding with one of the first and second outlet 41 b and 41 c of the housing 41, thereby causing air introduced into the housing 41 to be exhausted to one of the first and second outlets 41 b and 41 c of the housing 41, or cutting off the circulation of the air.

That is, when the adjusting member 43 is rotated in the direction of the arrow A as shown in FIG. 5 so that the outlet 43 b of the adjusting member 43 coincides with the first outlet 41 b of the housing 41, the air introduced into the inlet 41 a of the housing 41 is exhausted to the first outlet 41 b, and when the adjusting member 43 is rotated in the direction of the arrow B as shown in FIG. 6 so that the outlet 43 b of the adjusting member 43 coincides with the second outlet 41 c of the housing 41, the air introduced into the inlet 41 a of the housing 41 is exhausted to the second outlet 41 c. Further, when the outlet 43 b of the adjusting member 43 is located between the first and second outlets 41 b and 41 c of the housing 41 as shown in FIG. 7, both the first and second outlets 41 b and 41 c are closed. Since the width of the inlet 43 a of the adjusting member 43 is larger than the rotating range of the adjusting member 43, the inlet 43 a of the adjusting member 43 communicates with the inlet 41 a of the housing 41 at all times.

Since the first to third sensing switches 51, 52, and 53 sense the position of the outlet 43 b of the adjusting member 43 of the flow change unit 40, the operation of the flow control motor 44 is controlled so that the flow of the air is converted based on the sensed position of the outlet 43 b. That is, when the sensing cam 54 rotated together with the rotation of the adjusting member 43 contacts the first sensing switch 51 as shown in FIG. 5, the outlet 43 b of the adjusting member 43 is communicated with the first outlet 41 b of the housing 41, when the sensing cam 54 contacts the third sensing switch 53 as shown in FIG. 6, the outlet 43 b of the adjusting member 43 is communicated with the second outlet 41 c of the housing 41, and when the sensing cam 54 contacts the second sensing switch 52 as shown in FIG. 7, the outlet 43 b of the adjusting member 43 is located between the first and second outlets 41 b and 41 c of the housing 41.

Hereinafter, the usage and operation of the heating apparatus for cooking in accordance with the first embodiment will be described in detail.

When the quantity of food to be cooked is small, a user selects one of the two cooking chambers 11 a and 11 b so that the food is cooked only in the selected cooking chamber 11 a or 11 b. For example, when the user selects the first cooking chamber 11 a, the first heater 23 a and the first circulation fan 22 a in the rear of the first cooking chamber 11 a are operated. Here, the second heater 23 b and the second circulation fan 22 b in the rear of the non-selected second cooking chamber 11 b are not operated. Accordingly, the user cooks the small quantity of food under the condition that consumption of energy for cooking the food is reduced.

When the user selects the second cooking chamber 11 b so that food is cooked in the second cooking chamber 11 b, the second heater 23 b and the second circulation fan 22 b are operated, and the first heater 23 a and the first circulation fan 22 a are not operated. Further, when the partition 16 is removed from the cooking chamber 11 so that the two cooking chambers 11 a and 11 b are used, the first and second heaters 23 a and 23 b and the first and second circulation fans 22 a and 22 b are operated, thereby allowing a large quantity of food to be cooked.

During the cooking of the food, the air blowing unit 31 is not operated, and the closed states of the first and second outlets 41 b and 41 c of the flow change unit 40 are maintained as shown in FIG. 7. This prevents the cooking chamber 11 from being ventilated during the cooking of the food, thereby reducing heat loss.

After the cooking of the food is completed, the operations of the heaters 23 a and 23 b and the circulation fans 23 a and 23 b are terminated and the first cooking chamber 11 a or the second cooking chamber 11 b is ventilated by the operation of the air blowing unit 31, thereby cooling the first or second cooking chamber 11 a or 11 b. Accordingly, the user can take the cooked food from the first or second cooking chamber 11 a or 11 b without the danger of a burn. The above operations are achieved under the control of a predetermined program.

That is, when food is cooked in the first cooking chamber 11 a, a control unit (not shown) of the heating apparatus for cooking terminates the operations of the first heater 23 a and the first circulation fan 22 a after a cooking time determined by the user has elapsed, and operates the air blowing unit 31. Further, the control unit controls the operation of the flow change unit 40 so that the blown air is introduced into the first cooking chamber 1 a. Here, in the flow change unit 40, the outlet 43 b of the adjusting member 43 is communicated with the first outlet 41 b of the housing 41 by the operation of the flow control motor 44, thereby causing the blown air to be introduced into the first cooking chamber 11 a. Since hot air in the first cooking chamber 11 a in an amount corresponding to the amount of the newly introduced external air is exhausted to the outside through the first air exhaust guide member 34 a, the first cooking chamber 11 a is rapidly cooled.

When food is cooked in the second cooking chamber 11 b, in the same manner, the control unit terminates the operations of the second heater 23 b and the second circulation fan 22 b after the cooking time determined by the user has elapsed, and operates the air blowing unit 31. The blown air is introduced into the second cooking chamber 11 b by the operation of the flow change unit 40. Here, the control unit controls the operation of the flow control motor 44 so that the outlet 43 b of the adjusting member 43 is communicated with the second outlet 41 c of the housing 41, thereby causing the blown air to be introduced into the second cooking chamber 11 b.

When foods in the first and second cooking chambers 11 a and 11 b are simultaneously cooked, even if air is introduced into one of the first and second cooking chambers 11 a and 11 b, the first or second cooking chamber 11 a or 11 b can be ventilated. Accordingly, the flow change unit 40 is controlled such that any one of the outlets 41 b and 41 c of the housing 41 is communicated with one of the two cooking chambers 11 a and 11 b. In an exemplary embodiment, the flow control motor 44 is alternately rotated in regular and reverse directions by the control of the control unit so that air is alternately blown to the two cooking chambers 11 a and 11 b.

FIGS. 8 to 14 illustrate a heating apparatus for cooking in accordance with a second embodiment of the present invention. As shown in FIG. 8, the heating apparatus for cooking of the second embodiment comprises a main body 100 provided with a cooking chamber 111 installed therein. The main body 100 includes an external case 120 made of an iron plate, and an internal case 130 installed in the external case 120 for defining the cooking chamber 110 under the condition that the internal case 130 is separated from the external case 120. The front surface of the cooking chamber 110 is opened so that food to be cooked is inserted into or taken out of the cooking chamber 110.

A door 140 vertically rotated for opening and closing the cooking chamber 110 is installed at the front surface of the main body 100, and an operating panel 150 is installed on the front surface of the main body 100 above the door 140.

The cooking chamber 110 is divided into a first cooking chamber 111 located at the upper portion thereof and a second cooking chamber 112 located at the lower portion thereof by a detachable partition 160. That is, the cooking chamber 110 is divided into the first cooking chamber 111 and the second cooking chamber 112 by installing the partition 160 therein, and the first cooking chamber 111 and the second cooking chamber 112 are combined into the cooking chamber 110 by eliminating the partition 160. Food racks 171 and 172 for placing food thereon are respectively installed in the first and second cooking chambers 111 and 112, and a plurality of support rails 181, 182, and 183 for detachably supporting the partition 160 and the food racks 171 and 172 are formed on both side surfaces of the cooking chamber 110. After the partition 160 is separated from the cooking chamber 110, another food rack having the same shape as those of the food racks 171 and 172 of the first and second cooking chambers 111 and 112 may be installed at the position of the partition 160.

As shown in FIG. 8, a heater case portion 210 for forming a heater chamber 200 is recessed in the rear surface of the internal case 130 by a designated depth. A first circulation fan 221 for circulating air in the first cooking chamber 111 is installed in the upper portion of the inside of the heater chamber 200, and a first heater 231 is installed at the outside of the first circulation fan 221. A second circulation fan 222 for circulating air in the second cooking chamber 112 is installed in the lower portion of the inside of the heater chamber 200, and a second heater 232 is installed at the outside of the second circulation fan 222. The upper and lower portions of the heater chamber 200 are divided by a partition member 280, and first and second motors 241 and 242 for respectively driving the first and second circulation fans 221 and 222 are installed on the rear surface of the heater case portion 210. A cover 250 for covering the heater chamber 200 is installed at the front surface of the heater chamber 200, and inlets 261 and 262 and outlets 271 and 272 communicated with the first and second cooking chambers 111 and 112 are formed through the cover 250 so that air can be circulated through the inlets 261 and 262 and the outlets 271 and 272.

The above configuration causes the air in the first and second cooking chambers 111 and 112 to be respectively heated by the first and second heaters 231 and 232 when the air in the first and second cooking chambers 111 and 112 is circulated by the operation of the first and second circulation fans 221 and 222. The first circulation fan 221 and the first heater 231, or the second circulation fan 222 and the second heater 232 are selectively operated as occasion demands, thereby allowing one or all of the first and second cooking chambers 111 and 112 to be operated to cook food therein.

As shown in FIGS. 8 and 9, the heating apparatus for cooking of the second embodiment further comprises a ventilating device 300 for selectively ventilating one of the first and second cooking chambers 111 and 112. The ventilating device 300 includes an air blowing unit 400 installed between the internal case 130 and the external case 120 above the first cooking chamber 111 for blowing external air to the insides of the first and second cooking chambers 111 and 112, a flow change unit formed integrally with the air blowing unit 400 for selectively distributing the air blown by the air blown unit 400 to the first and second cooking chambers 111 and 112, air supply guide members 321, 322, and 323 for guiding the air to the first and second cooking chambers 111 and 112, and air exhaust guide members 331 and 332 for guiding the air from the first and second cooking chambers 111 and 112 to the outside.

As shown in FIGS. 10 and 11, the air blowing unit 400 includes a housing 410, the upper surface of which is opened, having an inlet 411 formed through the central portion thereof and first and second outlets 412 and 413 formed through separated positions of the circumference thereof, a cover 420 for covering the opened upper surface of the housing 410, a centrifugal air blowing fan 430 rotatably installed in the housing 410, and an air blowing motor 440 installed outside the housing 410 for rotating the air blowing fan 430. The air blowing fan 430 is rotated by the operation of the air blowing motor 440, thereby causing the air inhaled through the inlet 411 to be blown to the two outlets 412 and 413.

As shown in FIG. 9, the air supply guide members 321, 322, and 323 include a first air supply guide member 321 connected to the inlet 411 of the housing 410 of the air blowing unit 400 for introducing external air, a second air supply guide member 322 connecting the first outlet 412 of the housing 410 and the rear part of the first cooking chamber 111, and a third air supply guide member 323 connecting the second outlet 413 of the housing 410 and the rear part of the second cooking chamber 112. The air exhaust guide members 331 and 332 include a first air exhaust guide member 331 for exhausting air from the first cooking chamber 111, and a second air exhaust guide member 332 for exhausting air from the second cooking chamber 112.

The air blown by the operation of the air blowing unit 430 is selectively supplied to one of the first and second cooking chambers 111 and 112, thereby rapidly cooling the corresponding one of the first and second cooking chambers 111 and 112. Further, the air in the first and second cooking chambers 111 and 112 is exhausted to the outside through the air exhaust guide members 331 and 332 in proportion to the amount of the air supplied to the first and second cooking chambers 111 and 112.

As shown in FIGS. 10 and 11, the flow change unit formed integrally with the air blowing unit 400 includes a cylindrical adjusting member 500 rotatably installed outside the air blowing fan 430 in a housing 410, a flow control motor 510 for rotating the adjusting member 500 in regular and reverse directions, and a driving gear 520 and a driven gear 530 for transmitting the rotation of the flow control motor 510 to the adjusting member 500.

The adjusting member 500 has a cylindrical structure having the inner diameter larger than the outer diameter of the air blowing fan 430 so that the air blowing fan 430 is contained in the adjusting member 500, and the outer surface of the adjusting member 500 is guided by the inner surface of the housing 410 and rotated. The adjusting member 500 includes an outlet 501 formed through the circumference thereof so that the inside of the adjusting member 500 is selectively communicated with one of the first and second outlets 412 and 413 of the housing 410. The adjusting member 500 further includes a connection shaft 502 extended from the rotary center thereof to the outside through the cover 420 of the housing 410 and provided with a through hole 503 formed through the central portion thereof for passing a shaft 441 of the air blowing motor 440. As shown in FIG. 5, the shaft 441 extended from the air blowing motor 440 passes through the through hole 503 of the connection shaft 502 of the adjusting member 500, and is connected to the air blowing fan 430.

The flow control motor 510 is installed at one side of the air blowing motor 440 such that the flow control motor 510 is not interfered with the air blowing motor 440, and a shaft 511 of the flow control motor 510 and the connection shaft 502 of the adjusting member 500 are connected by the driving gear 520 and the driven gear 530 so that the rotation of the flow control motor 510 is transmitted to the adjusting member 500. That is, the driving gear 520 is installed on the shaft 511 of the flow control motor 510, and the driven gear 530 is installed on the connection shaft 502 under the condition that the driven gear 530 is engaged with the driving gear 520. The above structure transmits the rotation of the flow control motor 510 to the adjusting member 500 through the driving gear 520 and the driven gear 530, thus allowing the adjusting member 500 to be rotated. The direction of the air exhausted by the above procedure is adjustable. That is, when the adjusting member 500 is rotated in the direction of the arrow A as shown in FIG. 12 so that the outlet 501 of the adjusting member 500 coincides with the first outlet 412 of the housing 410, the air introduced into the inlet 411 of the housing 410 is exhausted to the first outlet 412, and when the adjusting member 500 is rotated in the direction of the arrow B as shown in FIG. 13 so that the outlet 501 of the adjusting member 500 coincides with the second outlet 413 of the housing 410, the air introduced into the inlet 411 of the housing 410 is exhausted to the second outlet 413.

Hereinafter, the usage and operation of the heating apparatus for cooking in accordance with the second embodiment will be described in detail.

When the quantity of food to be cooked is small, a user selects one of the two cooking chambers 111 and 112 so that the food is cooked only in the selected cooking chamber 11 or 112. For example, when the user selects the first cooking chamber 111, the first heater 231 and the first circulation fan 221 in the rear of the first cooking chamber 111 are operated. Here, the second heater 232 and the second circulation fan 222 in the rear of the non-selected second cooking chamber 112 are not operated. Accordingly, the user cooks the small quantity of food under the condition that consumption of energy for cooking the food is reduced.

When the user selects the second cooking chamber 112 so that food is cooked in the second cooking chamber 112, the second heater 232 and the second circulation fan 222 are operated, and the first heater 231 and the first circulation fan 221 are not operated. Further, when the partition 160 is removed from the cooking chamber 110 so that the two cooking chambers 111 and 112 are used, the first and second heaters 231 and 232 and the first and second circulation fans 221 and 222 are operated, thereby allowing a large quantity of food to be cooked.

After the cooking of the food is completed, the operations of the heaters 231 and 232 and the circulation fans 231 and 232 are terminated and the first cooking chamber 111 or the second cooking chamber 112 is ventilated by the operation of the air blowing unit 400, thereby cooling the first or second cooking chamber 111 or 112. Accordingly, the user can take the cooked food from the first or second cooking chamber 111 or 112 without the danger of a burn. The above operations are achieved under the control of a predetermined program.

That is, when food is cooked in the first cooking chamber 111, a control unit (not shown) of the heating apparatus for cooking terminates the operations of the first heater 231 and the first circulation fan 221 after a cooking time determined by the user has elapsed, and operates the air blowing unit 400. Further, the control unit controls the operation of the flow change unit so that the blown air is introduced into the first cooking chamber 111. Here, in the flow change unit, the outlet 501 of the adjusting member 500 is communicated with the first outlet 412 of the housing 410 by the operation of the flow control motor 510, thereby causing the blown air to be introduced into the first cooking chamber 111. Since hot air in the first cooking chamber 111 in an amount corresponding to the amount of the newly introduced external air is exhausted to the outside through the first air exhaust guide member 331, the first cooking chamber 111 is rapidly cooled.

When food is cooked in the second cooking chamber 112, in the same manner, the control unit terminates the operations of the second heater 232 and the second circulation fan 222 after the cooking time determined by the user has elapsed, and operates the air blowing unit 400. The blown air is introduced into the second cooking chamber 112 by the operation of the flow change unit. Here, the control unit controls the operation of the flow control motor 510 so that the outlet 501 of the adjusting member 500 is communicated with the second outlet 413 of the housing 410, thereby causing the blown air to be introduced into the second cooking chamber 112.

When foods in the first and second cooking chambers 111 and 112 are simultaneously cooked, even if air is introduced into one of the first and second cooking chambers 111 and 112, the first or second cooking chamber 111 or 112 can be ventilated. Accordingly, the flow change unit is controlled such that the outlet 510 of the adjusting member 500 is communicated with one of the two cooking chambers 111 and 112. In an exemplary embodiment, the flow control motor 510 is alternately rotated in regular and reverse directions by the control of the control unit so that air is alternately blown to the two cooking chambers 111 and 112.

As apparent from the above description, the present invention provides a heating apparatus for cooking, which ventilates the insides of cooking chambers after the cooking of food in the cooking chambers is completed, thereby rapidly cooking the insides of the cooking chambers.

Further, the heating apparatus for cooking adjusts the direction of blown air using a flow change unit to selectively ventilate one out of a plurality of cooking chambers, thereby cooling the selected cooking chamber.

Although embodiments of the invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents. 

1. A heating apparatus for cooking comprising: a main body comprising a plurality of cooking chambers which are separable from each other; a plurality of heaters for respectively heating the plurality of cooking chambers; and a ventilating device for ventilating at least one of the plurality of cooking chambers by introducing external air, wherein the ventilating device comprises an air blowing unit for blowing the external air to insides of the at least one of the plurality of cooking chambers, and a flow change unit for selectively supplying air blown by the air blowing unit to the at least one of the plurality of cooking chambers.
 2. The heating apparatus as set forth in claim 1, wherein the plurality of cooking chambers comprises a first cooking chamber and a second cooking chamber, and the plurality of heaters comprises a first heater for heating the first cooking chamber and a second heater for heating the second cooking chamber.
 3. The heating apparatus as set forth in claim 2, wherein the flow change unit comprises: a housing having an inlet connected to an outlet of the air blowing unit, and a first outlet and a second outlet respectively connected to the first and the second cooking chambers; an adjusting member rotatably installed in the housing for selectively opening one of the first and the second outlets; and a flow control motor for rotating the adjusting member.
 4. The heating apparatus as set forth in claim 3, wherein: the housing and the adjusting member have a cylindrical structure; and the adjusting member comprises an inlet having a width larger than a rotating range of the adjusting member, and a third outlet having a width corresponding to the width of the first or the second outlet of the housing.
 5. The heating apparatus as set forth in claim 4, wherein the flow change unit further comprises a sensing unit for sensing a position of the third outlet of the adjusting member.
 6. The heating apparatus as set forth in claim 5, wherein the sensing unit comprises: a plurality of sensing switches for respectively sensing whether or not the third outlet of the adjusting member coincides with the first outlet of the housing concides with the second outlet of the housing, or is located between the first and the second outlets of the housing; and a sensing cam connected to a shaft of the flow control motor so that the sensing cam can selectively contact one of the plurality of sensing switches.
 7. The heating apparatus as set forth in claim 3, wherein the ventilating device comprises: a first air supply guide member connecting the air blowing unit and the inlet of the housing; a second air supply guide member connecting the first outlet of the housing and the first cooking chamber; a third air supply guide member connecting the second outlet of the housing and the second cooking chamber; and a first air exhaust guide member and a second air exhaust guide member for respectively exhausting air from the first and the second cooking chambers.
 8. The cooking chamber as set forth in claim 2, wherein the first and second cooking chambers are separated from each other by installing a detachable partition, or communicate with each other by eliminating the partition.
 9. A heating apparatus for cooking comprising: a main body comprising a cooking chamber; a heater for heating an inside of the cooking chamber; a ventilating device for ventilating the cooking chamber; and a control unit for controlling the ventilating device so that the ventilating device is operated when cooking of food is completed.
 10. The heating apparatus as set forth in claim 9, wherein the ventilating device comprises: an air blowing unit for blowing external air to the inside of the cooking chamber; an air supply guide member for guiding air blown by the air blowing unit; and an air exhaust guide member for guiding air exhausted from the cooking chamber to the outside.
 11. A heating apparatus for cooking comprising: a main body comprising a plurality of cooking chambers which are separable from each other; a plurality of heaters for respectively heating the plurality of cooking chambers; and a ventilating device for ventilating at least one of the plurality of cooking chambers by introducing external air, wherein the ventilating device comprises an air blowing unit for blowing the external air to insides of the at least one of the plurality of cooking chambers, and a flow change unit formed integrally with the air blowing unit for selectively supplying air blown by the air blowing unit to the at least one of the plurality of cooking chambers.
 12. The heating apparatus as set forth in claim 11, wherein the air blowing unit comprises: a housing comprising an inlet formed through a central portion thereof, and a plurality of outlets formed through separated positions of a circumference thereof; an air blowing fan installed in the housing; and an air blowing motor installed outside the housing for rotating the air blowing fan.
 13. The heating apparatus as set forth in claim 12, wherein the flow change unit comprises: a cylindrical adjusting member rotatably installed in the housing, and comprising an outlet selectively communicating with one of the plurality of outlets of the housing; and a flow control motor for rotating the adjusting member.
 14. The heating apparatus as set forth in claim 13, further comprising: a connection shaft extended from a rotary center of the adjusting member to an outside of the housing, and provided with a through hole formed through the central portion thereof for passing a shaft of the air blowing motor; and a plurality of gears installed outside the housing for transmitting a rotation of the flow control motor to the connection shaft.
 15. The heating apparatus as set forth in claim 12, further comprising: a plurality of air supply guide members for respectively connecting the plurality of outlets of the housing and the plurality of cooking chambers; and a plurality of air exhaust guide members for exhausting air from the plurality of cooking chambers.
 16. A method for cooking comprising: receiving external air; selectively supplying the external air to one of a plurality of air supply guides to generate guided air; introducing the guided air into one of a plurality of cooking chambers, the one of the plurality of cooking chamber having heated air; and cooling the heated air in the one of the plurality of cooking chambers.
 17. The method of claim 16, wherein the operation of selectively supplying the external air comprises: communicating one of the plurality of air supply guides to the received external air if the one of the plurality of cooking chambers is to be cooled; and alternatingly communicating two of the plurality of air supply guides to the received external air if two of the plurality of cooking chambers are to be cooled. 